分治算法实验报告

算法分析与设计实验报告

第 1 次实验

附录：完整代码

SelectMaxMin.cpp:

#include

#include

#include

#include

#include

using namespace std;

void SelectMaxMin(int *a,inti,intj,int&max,int&min) {

if(i==j)

{

max= a[i];

min =a[i];

return;

}

else

{

int mid=(i+j)/2;

intmaxi,maxj,mini,minj;

SelectMaxMin(a,i,(i+j)/2,maxi,mini);

SelectMaxMin(a,((i+j)/2)+1,j,maxj,minj);

if(maxi>maxj)

max=maxi;

else

max=maxj;

if(mini

min=mini;

else

min=minj;

return;

}

}

intmain()

{

clock_tstart,end,over;

start=clock();

end=clock();

over=end-start;

start=clock();

//freopen("in.txt","r",stdin);

//freopen("out.txt","w",stdout);

int m;

cout<<"Please input the number : ";

cin>> m;

int a[m];

srand((unsigned int)time(NULL));

cout<< "随机产生的数据(0-100)：";

for(inti=0; i

a[i] = rand()%100;

for(inti=0; i

cout<< a[i] << " ";

cout<

intmax,min;

SelectMaxMin(a,0,m-1,max,min);

cout<< "max = " << max <

cout<< "min = " << min <

end=clock();

printf("The time is %6.3f",(double)(end-start-over)/CLK_TCK); }